self-resonance pronunciation speaker and self-resonance pronunciation speaker method installation of

摘要

waterproof, and provides a good self-resonance pronunciation speaker of mounting resistance. Self resonant sound speaker 1 includes an actuator-type speaker unit 2, and a polymeric foam 3 that covers the entire outer surface of the speaker unit 2, it is to pronounce the external vibration from the speaker unit 2 as a plane wave . Polymeric foam 3 is a 10 to 30 times expansion ratio, it is preferable to have a structure of closed cells. In addition, the range of the thickness of the polymeric foam 3 is preferably at least 2mm, more preferably not less than 3mm. .BACKGROUND 1